/*16:9缩放*/
window.addEventListener('load', adaptation);
window.addEventListener('resize', adaptation);

function adaptation() {
  let el = document.getElementById('app')
  console.log({obj:el})
  const win_w = window.innerWidth;
  const win_h = window.innerHeight;
  const app_w = el.clientWidth;
  const app_h = el.clientHeight;
  const scale_w = win_w / app_w
  const sclae_h = win_h / app_h
  const left = -(app_w - win_w) / 2
  const top = -(app_h - win_h) / 2
  el.setAttribute('style', 'transform: scale(' + scale_w + ',' + sclae_h + ');left:' + left + 'px;top:' + top + 'px;');
}